Data Acquisition; Vicon Nexus - Noraxon TeleMyo DTS Operating Document

5. Data Acquisition

5.1 Vicon Nexus

Once the acquisition computer is turned on, double-click the Vicon Nexus icon.
Ensure the Vicon Giganet pre-amp is turned on, that the proper system configuration is
chosen and that the database being written to is correct.
Plug in the TeleMyo DTS receiver to the Vicon computer via USB. Ensure there
are no internet browsers open at the same time as there is an issue with the acquisition
computer being connected to the internet while trying to collect data. It appears to
interfere with the TeleMyo receiver and it desynchronizes the EMG probes. Turn on the
TeleMyo DTS receiver. It is properly interfacing with the computer when you hear a
chime. In Nexus, click on the System tab on the left-hand side of the window and select
#1 (Noraxon TeleMyo) in Devices. Click #1 (Noraxon TeleMyo) and in the
Properties pane underneath, change the number of EMG channels from 16 to 8, wait for
the device to synchronize, and then revert back to 16 channels. This is a Vicon/Noraxon
patch issue that does not allow the EMG system synchronize without doing this. Now, with the
16 channels selected right-click the voltage tab and add in each individual channel, one by
one, making sure it synchronizes until the desired number of channels is reached. A status
window will briefly appear each time a channel is successfully added. Once the desired
number of channels are added, right-click on Local Vicon System and then click
Resynchronize. Highlight the EMG channels and select Graph in the central viewing
window in Nexus. The EMG traces will show up if the device has been properly
synchronized. Follow the subject preparation steps outlined in section 3.
Do not forget to perform muscle tests for each of the muscles. When you record using
Nexus, all EMG data will be recorded as well. Periodically check that all the EMG probes
are still collecting data from the participant. This can be achieved by splitting the viewing
vertically and selecting the Graph view in Nexus.
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